You have a point and a slope given, so what you need is 
the point-slope formula:


 In place of y1, substitute 4, 
In place of m, substitute 4 
In place of x1, substitute (-6), 
Don't substitute anything for y or x.  Leave them as x and y
Then simplify to the form
In place of y1, substitute 4, 
In place of m, substitute 4 
In place of x1, substitute (-6), 
Don't substitute anything for y or x.  Leave them as x and y
Then simplify to the form 

 .
Edwin
.
Edwin